alt.hn

7/29/2026 at 4:15:57 PM

Show HN: Kedge – Full-stack cloud with forkable VM snapshots and global SQLite

by wgjordan

7/29/2026 at 5:15:06 PM

Caught my eye with this one. I'll be taking a closer look as this is one of those "I'd rather let someone else do it." type infrastructure bits :)

by nicksuperb

7/29/2026 at 5:33:08 PM

Thanks! I tried to make the sandbox-eval stdin interface as simple as possible so you could easily plug it anywhere. The executable docs run an actual full shell in a VM, since they're so fast and cheap to spin up- I hope the example made it clear how to use this feature!

by wgjordan

7/29/2026 at 5:47:51 PM

This is also extremely interesting to me.

An instant, ephemeral cloud sandbox is pretty handy.

by devmor

7/29/2026 at 5:58:17 PM

This is phenomenal, great work!

On the HN frontpage is Superlogical (I have no affiliation) right now, and I used the shell provided by the Kedge News demo to `ssh superlogical.jobs` from my browser on a phone on an instance started seconds earlier. :)

I didn't immediately spot the durability contract for volumes -- local NVMe like Fly, or sitting on some underlying system like EBS?

by tekacs

7/29/2026 at 6:15:44 PM

Thanks for the kind words!

> I didn't immediately spot the durability contract for volumes -- local NVMe like Fly, or sitting on some underlying system like EBS?

Persistent volumes use local NVMe that continuously syncs to object storage, so a similar architecture to Fly Sprites. It automatically recovers from host failures (with on-demand lazy restore), and you can manually migrate stable members to another region if needed.

I've positioned persistent volumes as an escape hatch for when you need an existing database app running in a VM, or when performance requirements outgrow the built-in replicated SQLite.

by wgjordan

7/29/2026 at 8:55:00 PM

Gotcha, interesting. I would love it to death if there were a way to run some CLI, maybe on the system, that gave you information on the current replication state of the disk!

by tekacs

7/29/2026 at 4:33:47 PM

this is super cool, bookmarking to give it a whirl

> As a demo, I made a Hacker News clone with story submission, votes, comments and auth in about 60 lines of Markdown, plus CSS

although why would you use it for evil

by vyedin

7/29/2026 at 5:09:42 PM

> although why would you use it for evil

I couldn't help it! Ben Johnson recently wrote a Litestream post touching on this topic [1]:

> multiple-writer distributed SQLite databases are the Lament Configuration and we are not explorers over great vistas of pain

I offer my sincerest apologies if this database release may have inadvertently opened the gates of Hell.

[1] https://fly.io/blog/litestream-writable-vfs/

by wgjordan

7/29/2026 at 7:04:25 PM

Fun fact: we also built our cloud platform based on Fly.io’s ideas, but we supercharged it with a custom Rust filesystem.

This platform powers full-stack applications for business users, including Playcode.ai.

For more information about our cloud platform, visit: https://playcode.io/cloud

by ianberdin

7/29/2026 at 7:21:00 PM

> Fun fact: we also built our cloud platform based on Fly.io’s ideas, but we supercharged it with a custom Rust filesystem.

this is not a fun fact. this is why no one sensible would consider you.

by lstodd

7/29/2026 at 9:06:44 PM

That's rude. It's a shameless plug and I'm happy I have discovered that project thanks to that shameless plug

by ithkuil

7/29/2026 at 6:13:21 PM

Two questions about the fork boundary. The snapshot is taken once when the process calls listen, so every later instance is a clone of the same frozen memory image, and anything seeded during init is identical across every clone in every region. That is exactly what the Linux vmgenid driver exists for, and it is why Lambda SnapStart had to ship explicit reseeding guidance. I could not find entropy, RNG or reseed anywhere in the runtime, performance or security docs, so is there a post-restore reseed hook, and does it fire before the first accept?

The other one is syzy. CRDT.md says eviction is operator-driven, that PRUNING.md is a design-stage contract and not yet code, and that a replica lagging beyond the hold window may transiently observe the departing duplicate, while the product headline offers scale to zero when idle, which mints offline replicas continuously. Who calls syzy_evict in the managed product?

by PersonalJarvis

7/29/2026 at 6:47:43 PM

These are both later-stage detail questions for when this project is further hardened for production workloads, but here's where each of these currently stands:

- Yes, there is a post-restore kernel reseed hook that happens after fork, and just before the trapped listen is continued. It doesn't use the vmgenid driver, it just calls the RNDRESEEDCRNG ioctl, so it would not be compatible with applications that depend on vmgenid notifications to reseed userspace PRNGs.

- In Syzy, the full pruning implementation is deferred for now; at the managed product's current small scale, it can simply eat the tiny overhead costs of un-collected garbage, while the user is only billed for the logical storage space consumed.

by wgjordan

7/29/2026 at 7:03:17 PM

[dead]

by flipped

7/29/2026 at 7:07:01 PM

[dead]

by rent74